Quiz 3 Solutions
... external power-supply leads? Add a power supply decoupling capacitor from the power supply lead to ground at the point where the lead connects to the circuit. See Figure 4-17. (b) How is undesirable feedback on the power supply leads between stages of a high-gain amplifier prevented? Isolate the sta ...
... external power-supply leads? Add a power supply decoupling capacitor from the power supply lead to ground at the point where the lead connects to the circuit. See Figure 4-17. (b) How is undesirable feedback on the power supply leads between stages of a high-gain amplifier prevented? Isolate the sta ...
Untitled
... Build an approximation to a balanced R-2R attenuator using 510 ohm, 1000 ohm, and 2000 ohm resistors. The attenuator should have three attenuation values (approximately 1/2, 1/4, and 1/8). Then drive it with the function generator, and measure and record attenuation vs. frequency at the 1/2 and 1/8 ...
... Build an approximation to a balanced R-2R attenuator using 510 ohm, 1000 ohm, and 2000 ohm resistors. The attenuator should have three attenuation values (approximately 1/2, 1/4, and 1/8). Then drive it with the function generator, and measure and record attenuation vs. frequency at the 1/2 and 1/8 ...
Zobel network
For the wave filter invented by Zobel and sometimes named after him see m-derived filters.Zobel networks are a type of filter section based on the image-impedance design principle. They are named after Otto Zobel of Bell Labs, who published a much-referenced paper on image filters in 1923. The distinguishing feature of Zobel networks is that the input impedance is fixed in the design independently of the transfer function. This characteristic is achieved at the expense of a much higher component count compared to other types of filter sections. The impedance would normally be specified to be constant and purely resistive. For this reason, they are also known as constant resistance networks. However, any impedance achievable with discrete components is possible.Zobel networks were formerly widely used in telecommunications to flatten and widen the frequency response of copper land lines, producing a higher-quality line from one originally intended for ordinary telephone use. However, as analogue technology has given way to digital, they are now little used.When used to cancel out the reactive portion of loudspeaker impedance, the design is sometimes called a Boucherot cell. In this case, only half the network is implemented as fixed components, the other half being the real and imaginary components of the loudspeaker impedance. This network is more akin to the power factor correction circuits used in electrical power distribution, hence the association with Boucherot's name.A common circuit form of Zobel networks is in the form of a bridged T. This term is often used to mean a Zobel network, sometimes incorrectly when the circuit implementation is, in fact, something other than a bridged T.Parts of this article or section rely on the reader's knowledge of the complex impedance representation of capacitors and inductors and on knowledge of the frequency domain representation of signals.↑